[POWERPC] Remove unused, undocumented #cpus property from cpus node

The #cpus property is unused and undocumented and is therefore
being removed.

Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/boot/dts/mpc8555cds.dts

@@ -17,7 +17,6 @@
 	#size-cells = <1>;
 
 	cpus {
-		#cpus = <1>;
 		#address-cells = <1>;
 		#size-cells = <0>;